<template>
  <div class="editor-part">
    <el-upload :action="uploadUrl" :before-upload="handleBeforeUpload" :on-success="handleUploadSuccess"
      :on-error="handleUploadError" name="file" :show-file-list="false" :headers="headers" style="display: none"
      ref="upload" v-if="this.type == 'url'">
    </el-upload>
    <div class="editor" ref="editor" :style="styles"></div>
    <span class="word-number">{{ textLength }}/{{ maxLength }}</span>
  </div>
</template>

<script>
import Quill from "quill";
import "quill/dist/quill.core.css";
import "quill/dist/quill.snow.css";
import "quill/dist/quill.bubble.css";
import { getToken } from "@/utils/auth";

export default {
  name: "Editor",
  props: {
    /* 编辑器的内容 */
    value: {
      type: String,
      default: "",
    },
    /* 高度 */
    height: {
      type: Number,
      default: null,
    },
    /* 最小高度 */
    minHeight: {
      type: Number,
      default: null,
    },
    /* 只读 */
    readOnly: {
      type: Boolean,
      default: false,
    },
    // 上传文件大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    /* 类型（base64格式、url格式） */
    type: {
      type: String,
      default: "url",
    },
    maxLength: {
      type: Number,
      default: 2000,
    }
  },
  data() {
    let self = this;
    return {
      uploadUrl: window.baseUrl + "/sys/common/fileUpload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken()
      },
      Quill: null,
      currentValue: "",
      options: {
        theme: "snow",
        bounds: document.body,
        debug: "warn",
        modules: {
          // 工具栏配置
          toolbar: {
            container: [
              [{  undo: 'undo_icon' }, { redo: 'redo_icon' }],
              ["bold", "italic", "underline", "strike"],       // 加粗 斜体 下划线 删除线
              ["blockquote", "code-block"],                    // 引用  代码块
              [{ list: "ordered" }, { list: "bullet" }],       // 有序、无序列表
              [{ indent: "-1" }, { indent: "+1" }],            // 缩进
              [{ size: ['12px', '14px', '16px', '18px', '20px', '24px', '36px'] }],   // 字体大小
              [{ header: [1, 2, 3, 4, 5, 6, false] }],         // 标题
              [{ lineheight: ["1", "1-5", "1-75", "2", "3", "4", "5"] }], //行高
              [{ color: [] }, { background: [] }],             // 字体颜色、字体背景颜色
              [{ align: [] }],                                 // 对齐方式
              ["clean"],                                       // 清除文本格式
              ["link", "image", "video"]                       // 链接、图片、视频
            ],
            handlers: {
              redo() {
                self.Quill.history.redo();
              },
              undo() {
                self.Quill.history.undo();
              }
            }
          }
        },
        placeholder: "请输入内容",
        readOnly: this.readOnly,
      },
      textLength: 0
    };
  },
  computed: {
    styles() {
      let style = {};
      if (this.minHeight) {
        style.minHeight = `${this.minHeight}px`;
      }
      if (this.height) {
        style.height = `${this.height}px`;
      }
      return style;
    },
  },
  watch: {
    value: {
      handler(val) {
        if (val !== this.currentValue) {
          this.currentValue = val === null ? "" : val;
          if (this.Quill) {
            this.Quill.pasteHTML(this.currentValue);
          }
        }
      },
      immediate: true,
    },
  },
  mounted() {
    this.init();
    this.toolbarTips()
  },
  beforeDestroy() {
    this.Quill = null;
  },
  methods: {
    init() {
      const editor = this.$refs.editor;
      // 增加字体大小配置项
      let fontSize = ['12px', '14px', '16px', '18px', '20px', '24px', '36px']
      Quill.imports['attributors/style/size'].whitelist = fontSize;
      Quill.register(Quill.imports['attributors/style/size']);

      // 撤销 恢复
      var icons = Quill.import("ui/icons");
      icons["undo"] = '<i style="font-weight: bolder;font-size: 16px;" class="el-icon-refresh-left"></i>';
      icons["redo"] = '<i style="font-weight: bolder;font-size: 16px;" class="el-icon-refresh-right"></i>';

      this.Quill = new Quill(editor, this.options);

      // 行高 配置项
      const Parchment = Quill.import("parchment");
      class lineHeightAttributor extends Parchment.Attributor.Class {}
      const lineHeightStyle = new lineHeightAttributor(
        "lineheight",
        "ql-lineheight",
        {
          scope: Parchment.Scope.INLINE,
          whitelist: ["1", "1-5", "1-75", "2", "3", "4", "5"],
        }
      );
      Quill.register({ "formats/lineHeight": lineHeightStyle }, true);

      // 如果设置了上传地址则自定义图片上传事件
      if (this.type == 'url') {
        let toolbar = this.Quill.getModule("toolbar");
        toolbar.addHandler("image", (value) => {
          this.uploadType = "image";
          if (value) {
            this.$refs.upload.$children[0].$refs.input.click();
          } else {
            this.quill.format("image", false);
          }
        });
      }
      this.Quill.pasteHTML(this.currentValue);
      this.Quill.on("text-change", (delta, oldDelta, source) => {
        const html = this.$refs.editor.children[0].innerHTML;
        const text = this.Quill.getText();
        const quill = this.Quill;
        this.currentValue = html;
        // console.log(html, text, quill)
        // 最大输入长度
        this.Quill.deleteText(this.maxLength, 4);
        this.textLength = this.Quill.getText().length - 1 || 0

        this.$emit("input", html);
        this.$emit("on-change", { html, text, quill });
      });
      this.Quill.on("text-change", (delta, oldDelta, source) => {
        this.$emit("on-text-change", delta, oldDelta, source);
      });
      this.Quill.on("selection-change", (range, oldRange, source) => {
        this.$emit("on-selection-change", range, oldRange, source);
      });
      this.Quill.on("editor-change", (eventName, ...args) => {
        this.$emit("on-editor-change", eventName, ...args);
      });
    },
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      // 校检文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      return true;
    },
    handleUploadSuccess(res, file) {
      // 获取富文本组件实例
      let quill = this.Quill;
      // 如果上传成功
      if (res.code == 200) {
        // 获取光标所在位置
        let length = quill.getSelection().index;
        // 插入图片  res.url为服务器返回的图片地址
        quill.insertEmbed(length, "image", window.baseUrl + res.data.fileName);
        // 调整光标到最后
        quill.setSelection(length + 1);
      } else {
        this.$message.error("图片插入失败");
      }
    },
    handleUploadError() {
      this.$message.error("图片插入失败");
    },
    toolbarTips() {
      // toolbar标题
      const titleConfig = [
        { Choice: '.ql-insertMetric', title: '跳转配置' },
        { Choice: '.ql-bold', title: '加粗' },
        { Choice: '.ql-italic', title: '斜体' },
        { Choice: '.ql-underline', title: '下划线' },
        { Choice: '.ql-header', title: '段落格式' },
        { Choice: '.ql-strike', title: '删除线' },
        { Choice: '.ql-blockquote', title: '块引用' },
        { Choice: '.ql-code', title: '插入代码' },
        { Choice: '.ql-code-block', title: '插入代码段' },
        { Choice: '.ql-font', title: '字体' },
        { Choice: '.ql-size', title: '字体大小' },
        { Choice: '.ql-list[value="ordered"]', title: '编号列表' },
        { Choice: '.ql-list[value="bullet"]', title: '项目列表' },
        { Choice: '.ql-direction', title: '文本方向' },
        { Choice: '.ql-lineheight', title: '行高' },
        { Choice: '.ql-header[value="1"]', title: 'h1' },
        { Choice: '.ql-header[value="2"]', title: 'h2' },
        { Choice: '.ql-align', title: '对齐方式' },
        { Choice: '.ql-color', title: '字体颜色' },
        { Choice: '.ql-background', title: '背景颜色' },
        { Choice: '.ql-image', title: '图像' },
        { Choice: '.ql-video', title: '视频' },
        { Choice: '.ql-link', title: '添加链接' },
        { Choice: '.ql-formula', title: '插入公式' },
        { Choice: '.ql-clean', title: '清除字体格式' },
        { Choice: '.ql-script[value="sub"]', title: '下标' },
        { Choice: '.ql-script[value="super"]', title: '上标' },
        { Choice: '.ql-indent[value="-1"]', title: '向左缩进' },
        { Choice: '.ql-indent[value="+1"]', title: '向右缩进' },
        { Choice: '.ql-header .ql-picker-label', title: '标题大小' },
        { Choice: '.ql-header .ql-picker-item[data-value="1"]', title: '标题一' },
        { Choice: '.ql-header .ql-picker-item[data-value="2"]', title: '标题二' },
        { Choice: '.ql-header .ql-picker-item[data-value="3"]', title: '标题三' },
        { Choice: '.ql-header .ql-picker-item[data-value="4"]', title: '标题四' },
        { Choice: '.ql-header .ql-picker-item[data-value="5"]', title: '标题五' },
        { Choice: '.ql-header .ql-picker-item[data-value="6"]', title: '标题六' },
        { Choice: '.ql-header .ql-picker-item:last-child', title: '标准' },
        { Choice: '.ql-size .ql-picker-item[data-value="small"]', title: '小号' },
        { Choice: '.ql-size .ql-picker-item[data-value="large"]', title: '大号' },
        { Choice: '.ql-size .ql-picker-item[data-value="huge"]', title: '超大号' },
        { Choice: '.ql-size .ql-picker-item:nth-child(2)', title: '标准' },
        { Choice: '.ql-align .ql-picker-item:first-child', title: '居左对齐' },
        { Choice: '.ql-align .ql-picker-item[data-value="center"]', title: '居中对齐' },
        { Choice: '.ql-align .ql-picker-item[data-value="right"]', title: '居右对齐' },
        { Choice: '.ql-align .ql-picker-item[data-value="justify"]', title: '两端对齐' }
      ]
      for (let item of titleConfig) {
        let tip = document.querySelector('.ql-toolbar ' + item.Choice)
        if (!tip) continue
        tip.setAttribute('title', item.title)
      }
    }
  },
};
</script>

<style>
.editor,
.ql-toolbar {
  white-space: pre-wrap !important;
  line-height: normal !important;
}

.quill-img {
  display: none;
}

.ql-snow .ql-tooltip[data-mode="link"]::before {
  content: "请输入链接地址:";
}

.ql-snow .ql-tooltip.ql-editing a.ql-action::after {
  border-right: 0px;
  content: "保存";
  padding-right: 0px;
}

.ql-snow .ql-tooltip[data-mode="video"]::before {
  content: "请输入视频地址:";
}


.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='12px']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='12px']::before {
  content: '12px';
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='14px']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='14px']::before {
  content: '14px';
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='16px']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='16px']::before {
  content: '16px';
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='18px']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='18px']::before {
  content: '18px';
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='20px']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='20px']::before {
  content: '20px';
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='24px']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='24px']::before {
  content: '24px';
}

.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='36px']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='36px']::before {
  content: '36px';
}

.ql-size-12px {
  font-size: 12px;
}

.ql-size-14px {
  font-size: 14px;
}

.ql-size-16px {
  font-size: 16px;
}

.ql-size-18px {
  font-size: 18px;
}

.ql-size-20px {
  font-size: 20px;
}

.ql-size-24px {
  font-size: 24px;
}

.ql-size-36px {
  font-size: 36px;
}

.ql-snow .ql-picker.ql-header .ql-picker-label::before,
.ql-snow .ql-picker.ql-header .ql-picker-item::before {
  content: "文本";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="1"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="1"]::before {
  content: "标题1";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="2"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="2"]::before {
  content: "标题2";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="3"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="3"]::before {
  content: "标题3";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="4"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="4"]::before {
  content: "标题4";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="5"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="5"]::before {
  content: "标题5";
}

.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="6"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="6"]::before {
  content: "标题6";
}

.ql-snow .ql-picker.ql-font .ql-picker-label::before,
.ql-snow .ql-picker.ql-font .ql-picker-item::before {
  content: "标准字体";
}

.ql-snow .ql-picker.ql-font .ql-picker-label[data-value="serif"]::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value="serif"]::before {
  content: "衬线字体";
}

.ql-snow .ql-picker.ql-font .ql-picker-label[data-value="monospace"]::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value="monospace"]::before {
  content: "等宽字体";
}

.ql-snow .ql-picker.ql-lineheight .ql-picker-label::before,
.ql-snow .ql-picker.ql-lineheight .ql-picker-item::before {
  content: "行高";
}
.ql-snow .ql-picker.ql-lineheight .ql-picker-label[data-value="1"]::before,
.ql-snow .ql-picker.ql-lineheight .ql-picker-item[data-value="1"]::before {
  content: "1";
}
.ql-snow .ql-picker.ql-lineheight .ql-picker-label[data-value="1-5"]::before,
.ql-snow .ql-picker.ql-lineheight .ql-picker-item[data-value="1-5"]::before {
  content: "1.5";
}
.ql-snow .ql-picker.ql-lineheight .ql-picker-label[data-value="1-75"]::before,
.ql-snow .ql-picker.ql-lineheight .ql-picker-item[data-value="1-75"]::before {
  content: "1.75";
}
.ql-snow .ql-picker.ql-lineheight .ql-picker-label[data-value="2"]::before,
.ql-snow .ql-picker.ql-lineheight .ql-picker-item[data-value="2"]::before {
  content: "2";
}
.ql-snow .ql-picker.ql-lineheight .ql-picker-label[data-value="3"]::before,
.ql-snow .ql-picker.ql-lineheight .ql-picker-item[data-value="3"]::before {
  content: "3";
}
.ql-snow .ql-picker.ql-lineheight .ql-picker-label[data-value="4"]::before,
.ql-snow .ql-picker.ql-lineheight .ql-picker-item[data-value="4"]::before {
  content: "4";
}
.ql-snow .ql-picker.ql-lineheight .ql-picker-label[data-value="5"]::before,
.ql-snow .ql-picker.ql-lineheight .ql-picker-item[data-value="5"]::before {
  content: "5";
}
.ql-snow .ql-picker.ql-lineheight {
  width: 70px;
}
.ql-snow .ql-editor .ql-lineheight-1 {
  line-height: 1;
}
.ql-snow .ql-editor .ql-lineheight-1-5 {
  line-height: 1.5;
}
.ql-snow .ql-editor .ql-lineheight-1-75 {
  line-height: 1.75;
}
.ql-snow .ql-editor .ql-lineheight-2 {
  line-height: 2;
}
.ql-snow .ql-editor .ql-lineheight-3 {
  line-height: 3;
}
.ql-snow .ql-editor .ql-lineheight-4 {
  line-height: 4;
}
.ql-snow .ql-editor .ql-lineheight-5 {
  line-height: 5;
}

.editor-part {
  position: relative;
}

.word-number {
  font-size: 12px;
  position: absolute;
  right: 10px;
  top: calc(100% - 20px);
}
</style>
